I think one of my recent levels from the "Level Design Game" thread could work in your E.L.F. The level from
this post.
If you plan on doing repeat levels like Lemmings (unlike ONML) in ELF, the easier version of the level would have the following stats:
title: "Every Which Way"
time limit: 5 minutes
RR: 99
number of lemmings: 16
number to save: 8
skills: 8 of each
It would be a level that fits in a "Fun" or "Tame"-like difficulty range.
Then the later, harder version of the level would have the following stats:
title: "Detour"
time limit: 2 minutes
RR: 99
number of lemmings: 16
number to save: 10 or 11
skills: 1 of each
That level would fit in, oh I dunno, "Taxing" or "Wild" maybe? Or a middle/late "Tricky"/"Crazy" perhaps.
Anyway, when the decision has been made to include my level, let me know and I'll do some final minor cleaning up of the graphics. Mainly related to the placement of those "spinning framethrower" objects I think. I could also add in some more decorative stuff.